Herr Eugen Duhrings revolution in science (AntiDuhring) 2026-02-16T04:06:03+03:00 DEBUG: VuFind\ILS\Driver\Folio: Token taken from global cache: eyJhbGciOiJIUzI1NiJ9.eyJzdWIiO... - Engels, Friedrich, 1820-1895 (International Publishers, 1966)